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kwayteow
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kwayteow
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Hi All, i have plan to make head dish like attach picture, but i can't to figure out how to do that. I already try to use loft command but it's not work because i cant get round shape, is there anyone can help me to make that drawing. sorry for my english

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kwayteow
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kwayteow
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You have provided only two views. Is the bottom of the object flat or not? I don't understand what you mean by "I can't get round shape". The object isn't round to begin with as far as I can see.

that dwg is only sample i want to make that kind of shape with different dimension size, i try to make it with loft command but not good looking as you can see in dwg side view is smooth and good looking round shape at the top and at the edge of dish. or is there another way to make this shape. btw that one is dish head of palm oil transport tank.

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kwayteow
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kwayteow
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hi All, here i send the sample comparation between how i draw (blue) with sample (red), I was curious about how to way make the drawing like the sample (red). seem like more accurate and smooth, because i afraid my drawing will get problem when it go to fabrication.

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Cad64 50

Cad64
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I don't know, I was just looking at the wireframe mesh and thinking it might have been created in another program.

You could probably loft this shape in Autocad, but you would need to take a different approach. Look at the difference between the blue mesh and the red mesh. The red mesh has a lot fewer cross sections and they are horizontal and vertical. The blue mesh has too many cross sections and they are radial.

Try doing something like what I'm showing below, with just a few vertical cross sections. Creating something like this will be a lot of trial and error, refining the cross sections until you get a shape that works.

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BIGAL
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BIGAL
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A radial answer will create the best shape its like a football oval we have here in Aus that they are domed and often on a sloped plane complicating it. Becuase its earthern there is a lot of tolaernace in the shape so grader operator smooths it out.

It may be solvable by perhaps by having a fixed central dome and a edge curvature then a 3rd arc tangential to the two curves but has a constantly changing radius as you swing angle. Just not sure how smooth. It could be lisped for plan angle.

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kwayteow
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kwayteow
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A radial answer will create the best shape its like a football oval we have here in Aus that they are domed and often on a sloped plane complicating it. Becuase its earthern there is a lot of tolaernace in the shape so grader operator smooths it out.

It may be solvable by perhaps by having a fixed central dome and a edge curvature then a 3rd arc tangential to the two curves but has a constantly changing radius as you swing angle. Just not sure how smooth. It could be lisped for plan angle.

Software that do nurbs will do it easier.

Thanks for reply well actually I'm trying to figure out how to get the best shape because length size already have determined so to get volume that required i have to modify in shape, btw i haven't use nurbs in autocad before, but i will tried

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kwayteow
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kwayteow
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I don't know, I was just looking at the wireframe mesh and thinking it might have been created in another program.

You could probably loft this shape in Autocad, but you would need to take a different approach. Look at the difference between the blue mesh and the red mesh. The red mesh has a lot fewer cross sections and they are horizontal and vertical. The blue mesh has too many cross sections and they are radial.

Try doing something like what I'm showing below, with just a few vertical cross sections. Creating something like this will be a lot of trial and error, refining the cross sections until you get a shape that works.

Actually you right i use loft to create it, i use point at the end of loft command, how the way to make that shape

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Cad64 50

Cad64
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Actually you right i use loft to create it, i use point at the end of loft command, how the way to make that shape

Well, that explains why you ended up with the shape that you got. If you just used a point at the end of the loft then there was no framework for the loft to follow, to generate any sort of curvature across the surface.

I'm working today, but if I have time later, maybe I can put together an example of what I'm showing in the image, unless someone else gets to it before me.

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Cad64 50

Cad64
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Ok, here's a quick and dirty example of what I was proposing. The surface is a bit rough, since I only spent about 20 minutes on it, but you could get a much better and smoother looking surface if you spend more time on it.

You would also need to convert the surface to a solid in order to extrude the bottom, like what's shown in your first image. I tried to do it, using the CONVTOSOLID command, but of course, Autocad wouldn't cooperate, so I'm not sure how to make that happen. Autocad is such an unforgiving program, which is why I don't use it for 3D.

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kwayteow
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kwayteow
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Ok, here's a quick and dirty example of what I was proposing. The surface is a bit rough, since I only spent about 20 minutes on it, but you could get a much better and smoother looking surface if you spend more time on it.

You would also need to convert the surface to a solid in order to extrude the bottom, like what's shown in your first image. I tried to do it, using the CONVTOSOLID command, but of course, Autocad wouldn't cooperate, so I'm not sure how to make that happen. Autocad is such an unforgiving program, which is why I don't use it for 3D.

Anyway, those are my thoughts on how to create this object.

thanks sir for the reply it's enlighten me now, i never thought to do that way considered think that i'm gonna get problem to get a better shape, i'll try to do that way

update: I already try to do that way its work, but you are right the object can not convert to solid